Drill-rest



(No Model.)

H. C. LAUBAOH.

. DRILL BEST. No. 284,967. Patented Sept. 11, 1883.

- To all whom it may concern.-

UNITED STATES PATENT OFFICE.

HENRY G. LAUBACH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR 'IO EDWARD L. BARTLETT, OF BALTIMORE, MARYLAND.

DRILL-REST.

SPECIFICATION forming part of Letters Patent No. 284,967, dated September 11, 1883.

Application filed February 23, 1883. No model.) i

Be it known that I, HENRY C. LAUBAOII, of the city of Philadelphia, and State of Pennsylvania, have invented certain Improvements in Drill-Rests, of which the following is a l specification.

This invention relates to certain improvements in a device to be used in the drilling of architectural iron-work, and for a variety of other purposes where comparatively thin plates are to be drilled to furnish a support or abutment for the brace or ratchet drilling device; andit consists in certain details of construction of the said device, as will hereinafter fully appear.

In the further description of my said invention, which follows, reference is made to the accompanying drawings, which form a part hereof, and in which Figure I illustrates the application of my invention to a plate such as used in the construction of iron-front buildings. Fig. II is an end view of the rest without the plate and drilling device shown in Fig. I. Fig. III is a sectional plan of the invention, taken on the dotted line a at, Fig. II. Fig. IV is an under side view of the rest.

Similar letters of reference indicate similar parts in all the views.

. A is the rest proper, having the ordinary adjusting-screw, a, for supporting the centerpoint end of the brace B.

G is a bar hinged at its inner end to lugs D, and extending to about the end of the lower arm, b, of the rest.

E is a screw-clamp to compress the plate to be drilled, 0, between the arm I) and the bar 0. The lower end of the clamp E is formed of two removable bolts, (1, in order to admit of the clamp being applied from the upper side of the bar 0. Projections c preventthe sliding of the clamp E longitudinally of the arm I) and hinged bar 0.

By referring to Fig. I it will be seen that the plate to be drilled is held between the bar 0 and the arm I), and to allow for different thicknesses of plates the lugs D have several holes, f, any one of which is adapted for the reception of the pivotal bolt 9.. The outer ends of the bar 0 and arms I) are forked to admit the passage of the drill through the further setting of the drill.

plate 0 without striking any portion of the rest, and the said bar is marked with grooves h to guide the workman in adjusting the rest, as hereinafter described.

Supposing a plate is to be drilled, the position of the proposed hole is indicated by a center-punch mark on the plate. The rest is then applied and clamped to the plate, with the center-punch mark between the prongs of the bar C and intersected by the indicating-groovesj =This adjustment brings the and when the brace is applied the drilling operation may be commenced without any A spring, F, confined between the bar 0 and the arm I) of the rest, serves to raise the said bar when the screw a directly over the center-punch mark,

rest is to be changed to another position on p the plate. This enables the workman to change the position of the rest without handling the bar 0, as he would have to do if no distending device were used.

From the foregoing description it will be seen that my invention is a cheap and simple rest, which may be easily clamped to a plate and made self-supporting; that one person can do the adjusting of the rest and the drilling with ease, as the grooved fork of the bar C is the only guide required to bring the cen tering-screw a invariably over the centerpunch mark. It will be seen, further, that there are no loose parts to become detached in moving the rest from a drilled hole to the next center-punch mark, and that provision is made for plates of various thicknesses.

I claim as my invention- 1. In combination with the lower arm of a drill-rest, a hinged bar and a removable screw-clamp, E, whereby the rest is held to the plate to be drilled, substantially as and for the purpose specified.

2. In adrill-rest, the hinged bar 0, having a forked end, and the upper surface of the prongs of the fork provided with indicatinggrooves, substantially as and for the purpose specified.

. HENRY C. LAUBAGH. lVitnesses:

Enw. J. DIGGS,

WM. T. HOWARD- 

